Synthesis Of Novel Nickel-vanadium Heterostructure-based Electrocatalysts And Their Performance Studies

The development of efficient and non-precious electrocatalysts to produce hydrogen by electrolysis of water is critical to meeting the world’s growing energy demand and overcoming the challenges of global warming.Therefore,we developed two catalysts for hydrogen production from electrolytic water,Ni-V₂NO heterostructured carbon nanofibers modified with ruthenium nanoparticles,and vanadium-doped heterostructured materials Ni/V-Mo O₂/NF supported by nickel foam.The main elements are as follows:（1）We have successfully synthesized a non-Pt electrocatalyst in form of Ru nanoparticles decorated Ni-V₂NO heterostructures in carbon nanofibers（Ru/Ni-V₂NO/NCNFs）through annealing electrospun produced Ru-Ni₃V₂O₈-PAN nanofibers under Ar atmosphere.The integration of Ru nanoparticles and Ni-V₂NO heterostructures can regulate the electronic structure of Ru by the interaction among active components and thereby benefit the improvement of hydrogen evolution reaction（HER）performance.Meanwhile,enormously boosted ECSA can be detected as the introduction of Ni-V₂NO heterostructures,which reveals the favorable exposure of active sites.Thus,compared to the samples solo modified by Ru or Ni-V₂NO,the as-fabricated Ru/Ni-V₂NO/NCNFs has shown distinctly improved HER performance delivering an overpotential of merely 74.5 mV at 10m A cm^-2 with Tafel slope of 60.7 mV/dec and long-term stability in alkaline solution.（2）The development of efficient and non-precious electrocatalysts to produce hydrogen by electrolysis of water is critical to meeting the world’s growing energy demand and overcoming the challenges of global warming.In this work,we have successfully synthesized a new heterostructured material in form of Ni nanoparticles modified V doped Mo O₂ supported by Ni foam（Ni/V-Mo O₂/NF）and applied it as an excellent HER electrocatalyst under alkaline conditions.The introduction of V can tune the morphology of material to be further regular,which is conducive to the exposure of active sites and mass transport.Meanwhile,the V doping can modulate the electronic structure and boost the conductivity,which benefits the improvement of electrocatalytic HER performance.Thus,compared with the non-V-doped contrast sample,the as-prepared Ni/V-Mo O₂/NF has shown excellent and stable HER activity with a low overpotential of 13.1 mV at the current density of 10 m A cm^-2 and Tafel slope of 34.8 mV dec^-1.This work may provide positive suggestion for the design of high-performanced V-doped heterostructured electrocatalysts for various sustainable energy applications.